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Power due to a force actoing on a block varies with time `t` as shown in figure. Then angle between force acting on the block and its velocity is `:-` A. Obtuse at `t=1s`B. `90^(@)` at `t=3s`C. Acute at `t=7s`D. Both the stones reach the bottom at different times and with different speeds. |
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Answer» Correct Answer - D Power, `P=vec(F).vec(v)` so `P` positive `rArrthetalt90^(@)`, `P` negative `rArrthetagt90^(@)` and `P` zero `rArrtheta=90^(@)` |
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